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Unit 1 - Lesson 1: Attempts of Elements classification
Unit 1 - Lesson 1: Attempts of Elements classification
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1
The number of elements in Mendeleev's periodic table is.......... elements.
76
92
118
67
2
The scientist who left vacancies in his table to be filled with suitable discovered elements in future is.........
Rutherford.
Bohr.
Mendeleev.
Moseley.
3
Mendeleev classified the elements of each group into......... sub-groups.
3
4
2
5
4
The nucleus of the atom contains..........
negative protons.
negative elections.
positive protons.
positive electrons.
5
The scientist, who discovered that the nucleus of atom contains positively charged protons is.........
Moseley.
Mendeleev.
Rutherford.
Bohr.
6
The scientist....... had discovered the main energy levels.
Mendeleev.
Bohr.
Rutherford.
Moseley.
7
The number of energy levels in the heaviest known atom is .......... levels.
10
5
7
8
8
The number of known elements in the modern periodic table till now is............
216
118
16
316
9
The number of elements which exist in nature is..........
118
29
92
102
10
The modern periodic table consists of.......... horizontal periods.
14
7
18
10
11
The modern periodic table consists of......... vertical groups.
10
7
14
18
12
The elements, which occupy the middle block (d) in the periodic table are called.......... elements.
transition
noble
alkali
alkaline earth
13
The transitional elements start to appear from the beginning of the.......... period.
fifth
second
fourth
third
14
The block which contains the groups (1A) and (2A) in the periodic table is......... block.
f
p
s
d
15
The element, whose atomic number is (17) is similar in its chemical construction to the element whose atomic number is ...........
9
2
7
19
16
Elements of d-block are arranged in........... groups.
5
2
6
10
17
If the atomic number of an element is 15, so its group is located in...... block
d
s
f
p
18
Lanthanides and actinides are located in.......... the block.
p
f
d
s
19
Noble gases are located in group............
5A
2A
1A
7A
20
The atomic number of elements equals............
The number of electron and protons.
the number of electron.
the number of protons inside the nucleus.
the number of neutrons inside the nucleus.
21
Elements of group (6A) in the periodic table have the same........
number of electrons in the outer levels.
number of energy levels.
number of protons.
number of neutrons.
22
Elements of the same period in the modern periodic table have the same..........
number of energy levels.
number of electrons in the outer levels.
number of neutrons.
number of protons.
23
The number of negative electrons in the atom in its normal state equals..........
half the number of neutrons.
the number of protons.
twice the of protons.
the number of neutrons.
24
In the periodic table, the elements which are identical in properties lie in the same.........
energy level.
group.
period.
nucleus.
25
The element whose atomic number (18) is.........
halogen element.
metallic element.
transition element.
inert gas.
26
The atomic number of an element that exists in group (7A) and period (2) is.........
12
9
7
17
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